Suggested that this article be merged with 'inane and boring'. Or: Why I hated the movie 2001: A Space Oddessy

In one scene, a flight attendant grabs the pen of a sleeping Heywood Floyd as it floats in zero gravity inside a spaceship cabin. The pen is rotating, but it is not rotating about its own center of mass; instead, it is rotating about a center that is significantly external to the pen. This happens because, in reality, the pen was mounted on a large, transparent, rotating disk from which the actress playing the flight attendant plucked it, and it was not mounted at the center of the disk. In an actual zero-gravity environment, some force would have to be acting upon the pen in order to compel it to rotate around anything other than its own center of mass.
-http://en.wikipedia.org/wiki/2001:_A_Space_Odyssey_%28film%29